In Resident Evil Zero, Billy had a tribal tattoo sleeve spelling the phrase "Mother Love". Billy's tattoo was present in the original Nintendo 64 prototype and made a return in the Zero retelling in Resident Evil: The Umbrella Chronicles.
- Resident Evil Zero
- Resident Evil: The Umbrella Chronicles
- The decal was inspired by track 4 of the Queen album, Made in Heaven. Other references to the album include Made in Heaven and Let Me Live.